array "fileCombo" load file1 into the array
splitting each line by ":" so you will get [0]example@example.com, [1]password
splitting value [0] by "@" so you will get [0]example, [1]example.com
putting value [1] into new array called "domains"
counting how many duplicates of each domain
putting all the domains that have less than 2 dupes inside new array that called "less"
runing 1 by 1 each domain in "less" array on "fileCombo" array
if "less" value was found inside "fileCombo" array value Than
write the entire line from "fileCombo" into a text file

This script used for big files with 2~5M lines evrey time thats why i need it to be optimized (its fast when u run like 20k lines on it).